code: def test_distance():
      data_path = os.path.join(this_dir, "data", "1b5e_1.mol2")
  
      pdmol = PandasMol2().read_mol2(data_path)
      assert round(pdmol.distance().values[0], 3) == 31.185
  
file_path: biopandas/biopandas/mol2/tests/test_pandas_mol2.py
imports: import os
  from biopandas.mol2 import PandasMol2
  from biopandas.mol2.mol2_io import split_multimol2
  from biopandas.testutils import assert_raises
label_desc: Use image node_id 4 for calling a global function with example usage: test_distance() without return types